<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>小黑记事本</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            background-color: #F0F0F0;
        }

        .todo {
            background-color: red !important;
            width: 98%;
            list-style: none;
            line-height: 35px;
            border-top: 0.5px solid #E0E0E0;
            border-bottom: 0.5px solid #E0E0E0;
            border-left: 1px solid #E0E0E0;
            border-right: 1px solid #E0E0E0;
        }

        #todoapp {
            width: 280px;
            margin: 100px auto;
        }

        h1 {
            font-family: "隶书";
            font-size: 32px;
            color: saddlebrown;
            text-align: center;
            margin-bottom: 40px;
        }

        input::-webkit-input-placeholder {
            color: #9C9C9C;
        }

        .new-todo {
            outline: none;
            width: 95%;
            height: 35px;
            border: 1px solid #E0E0E0;
            background-color: white;
            padding: 0 4px;
            color: #9C9C9C;
            font-size: 15px;
        }

        .view {
            display: flex;
            padding: 0 4px;
            color: #9C9C9C;
            font-size: 15px;
            background-color: white;
        }

        .index {
            flex: 1;
            background-color: white;
        }

        label {
            flex: 10;
            background-color: white;
        }

        .destroy {
            flex: 1;
            display: none;
            color: red;
            border: none;
            background-color: white;
        }

        .view:hover .destroy {
            display: block;
        }

        .todo-count {
            display: block;
            width: 95%;
            line-height: 20px;
            color: #9C9C9C;
            font-size: 10px;
            padding: 0 4px;
            border: 0.5px solid #E0E0E0;
            background-color: white;
            /*box-shadow:5px 5px 20px rosybrown;*/
            box-shadow:
                0 0.0625px 0.1875em 0 rgb(0 0 0 / 16%),
                0 0.5em 0 -0.25em #f2f2f2ed,
                0 0.5em 0.1875em -0.25em rgba(0, 0, 0, 1),
                0 1em 0 -0.5em #e5e5e5,
                0 1em 0.1875em -0.5em rgba(0, 0, 0, 1);
        }

        strong {
            background-color: white;
        }

        .todo-clear {
            position: relative;
            background-color: white;
            color: #9C9C9C;
            font-size: 10px;
            top: -24px;
            left: 250px;
            border: none;
        }
    </style>
</head>

<body>
    <!-- 

        列表结构可以使用v-for指令进行
        v-on 结合事件修饰符可以对事件进行操作,比如.enter
        v-on 在绑定事件时可以传递自定义参数
        v-model 可以设置和获取表单元素的值
     -->

    <script src="../js/vue.js"></script>

    <section id="todoapp">
        <header class="header">
            <h1>小黑记事本</h1>
            <input v-model="inputValue" @keyup.enter="add" class="new-todo" autofocus="autofocus" autocomplete="off"
                placeholder="请输入任务" />
        </header>

        <section class="main">
            <ul class="todo-list">
                <li class="todo" v-for="(item,index) in list">
                    <div class="view">
                        <span class="index">{{index+1}}</span>
                        <label>{{item}}</label>
                        <button class="destroy" @click="remove(index)">×</button>
                    </div>
                </li>
            </ul>
        </section>
        <footer class="footer">
            <span class="todo-count" v-if="list.length!=0">
                <span>{{list.length}}数量</span> 统计数
            </span>
            <button class="todo-clear" @click="clear" v-if="list.length!=0">clear</button>
        </footer>
    </section>
</body>
<script>
    var app = new Vue({
        el: "#todoapp",
        data: {
            list: [],
            inputValue: "好好学习"
        },
        methods: {
            add: function () {
                this.list.push(this.inputValue)
            },
            remove: function (index) {
                this.list.pop(index, 1)
            },
            clear: function () {
                this.list = []
            }
        }
    })
</script>

</html>